<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			var str="字符串";
			var obj={
				title:"引用"
			}
			
			var a={
				str:str,
				obj:obj
			}
			var b={
				str:str,
				obj:obj
			}
			console.log(a,b);
			delete a.str;
			delete a.obj;
			console.log(a,b);
		</script>
	</body>
</html>
